Product Description
Genuine Delco Remy D-1903 Negative Alternator Diode (NOS)
Restore the electrical integrity of your classic General Motors vehicle with this genuine Delco Remy D-1903 Negative Alternator Diode. This New Old Stock (NOS) component is designed for selected 1962-1971 GM vehicles equipped with the Delco 10DN alternator, commonly found in models such as the Chevrolet Impala, Chevelle, Camaro, Corvette, and C/K Series Trucks; Pontiac GTO, Firebird, and Grand Prix; Oldsmobile Cutlass and 442; Buick Skylark and LeSabre; and Cadillac DeVille and Eldorado. As a critical part of your alternator's rectifier bridge, this diode ensures proper current flow, preventing battery discharge and maintaining a stable charging system.
Key Features:
- Brand: Delco Remy
- Part Number: D-1903
- OEM Number: 1959830
- Position: Negative
- Engine Fitment: For Delco 10DN Alternators
- Origin: Made in USA
- Condition: NOS (New Old Stock)
Fitment:
| Make | Model | Year | Engine | Notes |
| Chevrolet | Various Models | 1962-1971 | Various | With Delco 10DN Alternator |
| Pontiac | Various Models | 1962-1971 | Various | With Delco 10DN Alternator |
| Oldsmobile | Various Models | 1962-1971 | Various | With Delco 10DN Alternator |
| Buick | Various Models | 1962-1971 | Various | With Delco 10DN Alternator |
| Cadillac | Various Models | 1962-1971 | Various | With Delco 10DN Alternator |
Fits Years:
1962 1963 1964 1965 1966 1967 1968 1969 1970 1971
Note on Stock Photos: Due to our inventory of multiple identical units for this specific part number, we utilize representative stock photos for this listing. You will receive a component that strictly meets all listed specifications and fitment requirements. Please be aware that because these are vintage parts, minor cosmetic variations—such as surface finish, color, or production markings—may exist between different manufacturing runs. These slight aesthetic differences are a result of historical production processes and do not impact the part's integrity, performance, or authenticity.
A Note on Fitment Accuracy: We manually research our fitment data using vintage manufacturer catalogs to provide you with the most accurate information possible. However, because we are human and these decades-old resources can occasionally contain errors, we cannot guarantee 100% accuracy. We strongly encourage you to perform your own due diligence and verify this part number for your specific application before purchasing. Please note that this part may also fit other vehicles or years not explicitly listed in our research.
Unbeatable Prices & Expectations
While many of our vintage parts were manufactured decades ago, they remain unused and high-quality. Some original boxes may show signs of shelf-wear, such as dust, tape, or surface distress from years of storage. Rest assured, the components inside have been inspected to ensure they are complete and ready to help you finish your project without breaking the bank.
